Dust or particulates produced from swine housing contribute to health hazards and odor perception. The major health concern relates to small particles, which readily enter the lower respiratory system of pigs and workers. Endotoxins produced by bacteria often attach to dust particles and contribute to the respiratory symptoms of pigs and workers. Particles in the 0.5 to 2.5 micrometer range can penetrate deep into the lungs and may cause chronic respiratory problems. Particles ranging in size from 2.5 to 5 micrometers may aggravate existing health problems such as asthma.

The Environmental Protection Agency (EPA) has begun to apply industrial dust emission limits to pork production housing, making it even more critical to keep these emissions under control.

Adding at least 1% fat to diets and frequent washing of facility surfaces may reduce dust concentrations.